The paper explains the force induced by the electrostatic field on the electron as a recoil force. The starting point is the hypothesis that in the dynamic equilibrium with the vacuum, the electron simultaneously absorbs and emitts energy. With no external electrostatic field the radiation patterns of absorption and emission are assumed to be isotropic. The external electrostatic field induces anisotropy of the emission resulting in a recoil force. The paper presents a theoretical description of this force using a model of the angular power density pattern of the emission in the form of an ellipsoid. Calculations show that the total radiated power is extremely high. This radiation is compared with the electromagnetic radiation of the electron on the Bohr orbit in the idealized hydrogen atom. An analogous problem for gravitational forces is presented.